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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.channel;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <em class="jxr_javadoccomment"> * Enables a {@link ChannelHandler} to interact with its {@link ChannelPipeline}</em>
<a class="jxr_linenumber" name="21" href="#21">21</a>  <em class="jxr_javadoccomment"> * and other handlers.  A handler can send a {@link ChannelEvent} upstream or</em>
<a class="jxr_linenumber" name="22" href="#22">22</a>  <em class="jxr_javadoccomment"> * downstream, modify the {@link ChannelPipeline} it belongs to dynamically.</em>
<a class="jxr_linenumber" name="23" href="#23">23</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="24" href="#24">24</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Sending an event&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * You can send or forward a {@link ChannelEvent} to the closest handler in the</em>
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> * same {@link ChannelPipeline} by calling {@link #sendUpstream(ChannelEvent)}</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> * or {@link #sendDownstream(ChannelEvent)}.  Please refer to</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * {@link ChannelPipeline} to understand how an event flows.</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Modifying a pipeline&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * You can get the {@link ChannelPipeline} your handler belongs to by calling</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * {@link #getPipeline()}.  A non-trivial application could insert, remove, or</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * replace handlers in the pipeline dynamically in runtime.</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Retrieving for later use&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * You can keep the {@link ChannelHandlerContext} for later use, such as</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * triggering an event outside the handler methods, even from a different thread.</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * public class MyHandler extends {@link SimpleChannelHandler}</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> *                        implements {@link LifeCycleAwareChannelHandler} {</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> *     &lt;b&gt;private {@link ChannelHandlerContext} ctx;&lt;/b&gt;</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> *     public void beforeAdd({@link ChannelHandlerContext} ctx) {</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> *         &lt;b&gt;this.ctx = ctx;&lt;/b&gt;</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> *     }</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> *     public void login(String username, password) {</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> *         {@link Channels}.write(</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> *                 &lt;b&gt;this.ctx&lt;/b&gt;,</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> *                 {@link Channels}.succeededFuture(&lt;b&gt;this.ctx.getChannel()&lt;/b&gt;),</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> *                 new LoginMessage(username, password));</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> *     }</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> *     ...</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * }</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Storing stateful information&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> * {@link #setAttachment(Object)} and {@link #getAttachment()} allow you to</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * store and access stateful information that is related with a handler and its</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> * context.  Please refer to {@link ChannelHandler} to learn various recommended</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> * ways to manage stateful information.</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;A handler can have more than one context&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> * Please note that a {@link ChannelHandler} instance can be added to more than</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> * one {@link ChannelPipeline}.  It means a single {@link ChannelHandler}</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> * instance can have more than one {@link ChannelHandlerContext} and therefore</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> * the single instance can be invoked with different</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> * {@link ChannelHandlerContext}s if it is added to one or more</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * {@link ChannelPipeline}s more than once.</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * For example, the following handler will have as many independent attachments</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * as how many times it is added to pipelines, regardless if it is added to the</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * same pipeline multiple times or added to different pipelines multiple times:</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * public class FactorialHandler extends {@link SimpleChannelHandler} {</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> *   // This handler will receive a sequence of increasing integers starting</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> *   // from 1.</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> *   {@code @Override}</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> *   public void messageReceived({@link ChannelHandlerContext} ctx, {@link MessageEvent} evt) {</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> *     Integer a = (Integer) ctx.getAttachment();</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> *     Integer b = (Integer) evt.getMessage();</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="90" href="#90">90</a>  <em class="jxr_javadoccomment"> *     if (a == null) {</em>
<a class="jxr_linenumber" name="91" href="#91">91</a>  <em class="jxr_javadoccomment"> *       a = 1;</em>
<a class="jxr_linenumber" name="92" href="#92">92</a>  <em class="jxr_javadoccomment"> *     }</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>  <em class="jxr_javadoccomment"> *     ctx.setAttachment(Integer.valueOf(a * b));</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>  <em class="jxr_javadoccomment"> *   }</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>  <em class="jxr_javadoccomment"> * }</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="98" href="#98">98</a>  <em class="jxr_javadoccomment"> * // Different context objects are given to "f1", "f2", "f3", and "f4" even if</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>  <em class="jxr_javadoccomment"> * // they refer to the same handler instance.  Because the FactorialHandler</em>
<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * // stores its state in a context object (as an attachment), the factorial is</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * // calculated correctly 4 times once the two pipelines (p1 and p2) are active.</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * FactorialHandler fh = new FactorialHandler();</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * {@link ChannelPipeline} p1 = {@link Channels}.pipeline();</em>
<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * p1.addLast("f1", fh);</em>
<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * p1.addLast("f2", fh);</em>
<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * {@link ChannelPipeline} p2 = {@link Channels}.pipeline();</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * p2.addLast("f3", fh);</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * p2.addLast("f4", fh);</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * &lt;h3&gt;Additional resources worth reading&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * Please refer to the {@link ChannelHandler}, {@link ChannelEvent}, and</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * {@link ChannelPipeline} to find out what a upstream event and a downstream</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> * event are, what fundamental differences they have, how they flow in a</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * pipeline,  and how to handle the event in your application.</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * @apiviz.owns org.jboss.netty.channel.ChannelHandler</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">interface</strong> <a href="../../../../org/jboss/netty/channel/ChannelHandlerContext.html">ChannelHandlerContext</a> {
<a class="jxr_linenumber" name="123" href="#123">123</a> 
<a class="jxr_linenumber" name="124" href="#124">124</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment">     * Returns the {@link Channel} that the {@link ChannelPipeline} belongs to.</em>
<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment">     * This method is a shortcut to &lt;tt&gt;getPipeline().getChannel()&lt;/tt&gt;.</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="128" href="#128">128</a>     <a href="../../../../org/jboss/netty/channel/Channel.html">Channel</a> getChannel();
<a class="jxr_linenumber" name="129" href="#129">129</a> 
<a class="jxr_linenumber" name="130" href="#130">130</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment">     * Returns the {@link ChannelPipeline} that the {@link ChannelHandler}</em>
<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment">     * belongs to.</em>
<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="134" href="#134">134</a>     <a href="../../../../org/jboss/netty/channel/ChannelPipeline.html">ChannelPipeline</a> getPipeline();
<a class="jxr_linenumber" name="135" href="#135">135</a> 
<a class="jxr_linenumber" name="136" href="#136">136</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * Returns the name of the {@link ChannelHandler} in the</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">     * {@link ChannelPipeline}.</em>
<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="140" href="#140">140</a>     String getName();
<a class="jxr_linenumber" name="141" href="#141">141</a> 
<a class="jxr_linenumber" name="142" href="#142">142</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment">     * Returns the {@link ChannelHandler} that this context object is</em>
<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment">     * serving.</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="146" href="#146">146</a>     <a href="../../../../org/jboss/netty/channel/ChannelHandler.html">ChannelHandler</a> getHandler();
<a class="jxr_linenumber" name="147" href="#147">147</a> 
<a class="jxr_linenumber" name="148" href="#148">148</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment">     * Returns {@code true} if and only if the {@link ChannelHandler} is an</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">     * instance of {@link ChannelUpstreamHandler}.</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="152" href="#152">152</a>     <strong class="jxr_keyword">boolean</strong> canHandleUpstream();
<a class="jxr_linenumber" name="153" href="#153">153</a> 
<a class="jxr_linenumber" name="154" href="#154">154</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment">     * Returns {@code true} if and only if the {@link ChannelHandler} is an</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * instance of {@link ChannelDownstreamHandler}.</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="158" href="#158">158</a>     <strong class="jxr_keyword">boolean</strong> canHandleDownstream();
<a class="jxr_linenumber" name="159" href="#159">159</a> 
<a class="jxr_linenumber" name="160" href="#160">160</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="161" href="#161">161</a> <em class="jxr_javadoccomment">     * Sends the specified {@link ChannelEvent} to the</em>
<a class="jxr_linenumber" name="162" href="#162">162</a> <em class="jxr_javadoccomment">     * {@link ChannelUpstreamHandler} which is placed in the closest upstream</em>
<a class="jxr_linenumber" name="163" href="#163">163</a> <em class="jxr_javadoccomment">     * from the handler associated with this context.  It is recommended to use</em>
<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment">     * the shortcut methods in {@link Channels} rather than calling this method</em>
<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment">     * directly.</em>
<a class="jxr_linenumber" name="166" href="#166">166</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="167" href="#167">167</a>     <strong class="jxr_keyword">void</strong> sendUpstream(<a href="../../../../org/jboss/netty/channel/ChannelEvent.html">ChannelEvent</a> e);
<a class="jxr_linenumber" name="168" href="#168">168</a> 
<a class="jxr_linenumber" name="169" href="#169">169</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment">     * Sends the specified {@link ChannelEvent} to the</em>
<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment">     * {@link ChannelDownstreamHandler} which is placed in the closest</em>
<a class="jxr_linenumber" name="172" href="#172">172</a> <em class="jxr_javadoccomment">     * downstream from the handler associated with this context.  It is</em>
<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_javadoccomment">     * recommended to use the shortcut methods in {@link Channels} rather than</em>
<a class="jxr_linenumber" name="174" href="#174">174</a> <em class="jxr_javadoccomment">     * calling this method directly.</em>
<a class="jxr_linenumber" name="175" href="#175">175</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="176" href="#176">176</a>     <strong class="jxr_keyword">void</strong> sendDownstream(<a href="../../../../org/jboss/netty/channel/ChannelEvent.html">ChannelEvent</a> e);
<a class="jxr_linenumber" name="177" href="#177">177</a> 
<a class="jxr_linenumber" name="178" href="#178">178</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="179" href="#179">179</a> <em class="jxr_javadoccomment">     * Retrieves an object which is {@link #setAttachment(Object) attached} to</em>
<a class="jxr_linenumber" name="180" href="#180">180</a> <em class="jxr_javadoccomment">     * this context.</em>
<a class="jxr_linenumber" name="181" href="#181">181</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="182" href="#182">182</a> <em class="jxr_javadoccomment">     * @return {@code null} if no object was attached or</em>
<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment">     *                      {@code null} was attached</em>
<a class="jxr_linenumber" name="184" href="#184">184</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="185" href="#185">185</a>     Object getAttachment();
<a class="jxr_linenumber" name="186" href="#186">186</a> 
<a class="jxr_linenumber" name="187" href="#187">187</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="188" href="#188">188</a> <em class="jxr_javadoccomment">     * Attaches an object to this context to store a stateful information</em>
<a class="jxr_linenumber" name="189" href="#189">189</a> <em class="jxr_javadoccomment">     * specific to the {@link ChannelHandler} which is associated with this</em>
<a class="jxr_linenumber" name="190" href="#190">190</a> <em class="jxr_javadoccomment">     * context.</em>
<a class="jxr_linenumber" name="191" href="#191">191</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="192" href="#192">192</a>     <strong class="jxr_keyword">void</strong> setAttachment(Object attachment);
<a class="jxr_linenumber" name="193" href="#193">193</a> }
</pre>
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